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X2Go server, nxagent causes segfault
by Kalle Tuulos 20 Mar '18

20 Mar '18

Hello I'm using X2Go server in several computers, all running Ubuntu. Just today, one of my computers (headless Linux box) just froze and I had to give it a power cycle reset. After powering up again, I can't any more connect to X2Go. I'm getting following into /var/log/syslog: ---8<---8<--- Mar 12 13:15:40 kallebuntu systemd[1]: Started Session 10 of user ktuulos. Mar 12 13:15:49 kallebuntu /usr/sbin/x2gocleansessions[1091]: ktuulos-50-1520853345_stDLXDE_dp32: state file for this session does not exist: /tmp/.x2go-ktuulos/C-ktuulos-50-1520853345_stDLXDE_dp32/state (this can be ignored during session startups) Mar 12 13:15:51 kallebuntu /usr/bin/x2gostartagent: successfully started X2Go Agent session with ID ktuulos-50-1520853345_stDLXDE_dp32 Mar 12 13:15:58 kallebuntu kernel: [ 1315.845394] nxagent[9647]: segfault at 8 ip 000056286f70db3a sp 00007ffea2bd1bc0 error 4 in nxagent[56286f693000+432000] Mar 12 13:16:04 kallebuntu /usr/bin/x2gosetkeyboard: Setting X keyboard according to /home/ktuulos/.x2go/C-ktuulos-50-1520853345_stDLXDE_dp32/keyboard Mar 12 13:16:05 kallebuntu /usr/bin/x2goruncommand: launching session with Xsession-x2go mechanism, using STARTUP="startlxde" Mar 12 13:16:05 kallebuntu /usr/bin/x2goruncommand: dbus wrapper available as /usr/bin/dbus-run-session ---8<---8<--- This computer is running Ubuntu 16.04. X2go server has been installed using the ppa method. ---8<---8<--- ktuulos@kallebuntu:~$ uname -a Linux kallebuntu 4.13.0-36-generic #40~16.04.1-Ubuntu SMP Fri Feb 16 23:25:58 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux ktuulos@kallebuntu:~$ dpkg -s x2goserver | grep Version Version: 4.1.0.0-0~1517~ubuntu16.04.1 ktuulos@kallebuntu:~$ cat /etc/apt/sources.list.d/x2go-ubuntu-stable-xenial.list deb http://ppa.launchpad.net/x2go/stable/ubuntu xenial main # deb-src http://ppa.launchpad.net/x2go/stable/ubuntu xenial main ---8<---8<--- There seem to be no hardware problems - I installed mcelog and I'm now monitoring its output. Nothing. Could anyone give some hints? I have spent the last hour googling about "nxagent segfault", but I haven't found anything, which would help. Thanks, Kalle

3 4

Best client/server pairings for RHEL 6 server and linux/windows clients?
by John Stoffel 20 Mar '18

20 Mar '18

Guys, I'm using x2go server on a CentOS 6.9 box, kept quite upto date, and I have no problems connecting to it from both the desktop of that system, and from home when I'm connecting in from a Linux desktop. My versions are: Server (Linux CentOS 6.9): x2goclient-4.0.1.4-1.el6.x86_64 x2goserver-4.0.1.20-1.el6.x86_64 x2golxdebindings-debuginfo-1.0.2.4-1.1.x86_64 x2goserver-xsession-4.0.1.20-1.el6.x86_64 python-x2go-0.5.0.3-1.el6.noarch x2goagent-3.5.0.32-3.1.x86_64 Linux Client (Linux Mint 18.3): ii nxproxy 2:3.5.0.33-0x2go1+git20180204.776+8.main.1 amd64 NX proxy ii x2go-keyring 2012.07.23~jessie~main~17~build1 all GnuPG keys of all X2Go developers and the X2Go archive ii x2goclient 4.1.1.1-0x2go1+git20180302.1732+8.main.1 amd64 X2Go Client application (Qt4) But when I try to use the latest client stuff from my Windows 7 system, I just get a connection which shows up for a second, then disconnects and returns me to the connection screen. I can't figure out what I'm doing wrong. But I'm loathe to upgrade my server just in case I break a working setup. In the meantime I've built a new CentOS-7.4 system, which is using the same packages as my CentOS 6.9 server, but for some reason I just can't reliably connect there either. Been following the mailing list for a while, since this is really my best option to be able to have my linux sessions travel around with me. But debugging has been a chore, since there are so many files and places which need to be looked into. And it's not clear WHY connections fail. And actually, does RHEL/CentOS 7 with a Gnome desktop even work? Is there an issue with OpenGL like there is with VNC desktops? Thanks, John

2 1

x2go problems - Ubuntu 16.04 - before and after new version upgrade
by Steven Spencer 19 Mar '18

19 Mar '18

Greetings, I sent this yesterday, but was not a member of the list, so wasn't sure if it would end up being approved and posted or not. Here's the content of that message and I apologize if this is a duplicate: We use x2go extensively for some access to some Ubuntu based LTSP servers. Suddenly over the last two days, we get the following in the client: "The remote proxy closed the connection while negotiating the session. This may be due to the wrong authentication credentials passed to the server." And on the server we are trying to connect to, we see this in the logs: /usr/bin/x2goresume-session: client [ip.address.of.client] has successfully resumed session with ID kscadmin-51-1520534328_stDMATE_dp24 /usr/bin/x2gosetkeyboard: /home/ksca0dmin/.x2go/C-kscadmin-51-1520534328_stDMATE_dp24/keyboard did not appear within 30s after agent startup We are never able to connect. This happens even on all servers that we connect to and includes older server versions: x2goagent: 3.5.0.33 x2goserver: 4.0.1.22 x2goserver-extensions: 4.0.1.22 x2goserver-xsession: 4.0.1.22 As well as newer ones: x2goserver: 4.1.0.0 x2goserver-common: 4.1.0.0 x2goserver-extensions: 4.1.0.0 x2goserver-fmbindings: 4.1.0.0 x2goserver-printing: 4.1.0.0 x2goserver-x2goagent: 3.5.99.14 x2goserver-xsession: 4.1.0.0 Unfortunately, the clients are now updated as well trying to fix this issue, but they were failing on the older client version as well: X2Go Client v. 4.1.1.1 (Qt - 4.8.7) Any help would be appreciated. Thanks, -- -- Steven G. Spencer, Network Administrator KSC Corporate - The Kelly Supply Family of Companies Office 308-382-8764 Ext. 1131 Mobile 402-765-8010

3 6

open another customizing Port Forward thought the SSH Connection to the x2go Server
by Feustel, Thomas 19 Mar '18

19 Mar '18

Hi, Is it possible to open an induvial port forward from the client machine to the x2go server? I need this for a windows software to connect to the Linux server. My first approach wars to use on the client a ssh_config, but the client creates the connection directly from the x2go client application with some ssh libs. So ok, the next approach wars to use the ssh_config on the Linux site, because for the printer and the file connection, the server open a ssh connection to a ssh-Daemon on the Client site. But the ssh connection use the option "ClearAllForwardings", so the forwards on a config-file are not working. So someone have an idea for this topic? Greetings

3 4

Some questions about X2go
by Torsten Kupke 19 Mar '18

19 Mar '18

Hi all, on my working PC there is running Ubuntu 16.04 with MATE Desktop (isn't the same as Ubuntu MATE, right?) and a X2go Server with Desktop Sharing extension. On my home PC with Windows 10 I have installed the X2go Client and inside it configured a session connecting to the Ubuntu host according to https://wiki.x2go.org/doku.php/doc:usage:desktop-sharing. The connection is successful, but there are some issues: 1. The Ubuntu host's desktop is spread over two 4/3 screens. But The Windows PC only has one screen with 1680x1050 Pixels. So the display from the Ubuntu host is highly horizontally compressed, so that the texts are nearly unreadable. OK, this behaviour is documented, but is there a way to get it more readable? 2. If I (to solve the above issue) switch to something other than full screen mode in the session settings, the session crashes, when started. I have to close and restart the X2go Client. And then with settings set back to full screen mode the session runs again. Is there a way to avoid the crash without full screen mode? 3. In full screen mode I cannot see any mouse cursor. So hitting any user elements inside or on the windows inside the display from the Ubuntu host is very difficult, since they are reduced to half the width. Is there a way to see a mouse cursor? Or is this due to the compressed display? 4. Since mouse using is so difficult, I tried to close the windows from the Ubuntu host by pressing <Alt><F4>. But then I get a question from X2go to close the session. Is there a way to propagate key combinitions like <Alt><F4> to the remote host? Sincerely tkansgar

4 4

Deprecation and removal of X2Go Plugin
by Mihai Moldovan 19 Mar '18

19 Mar '18

Hi Since most browsers either stopped supporting NPAPI (or will be dropping support with the next ESR version) and Qt 5 does not feature a browser plugin architecture any longer, I will be ripping out code related to the X2Go Plugin in the development version of X2Go Client soonish. Expect the next version to not supply X2Go Plugin binaries. Mihai

3 2

Problems with X2go keyboard layout
by Thomas Stephan 15 Mar '18

15 Mar '18

Dear X2golist, we are using X2go to connect to our Ubuntu workstations from various clients. Since some days we had problems to get connected, now after updating client and server we can connect again. After connecting to the server we see the window with the desktop, and are able to start programs as usual. However, the keyboard seems to deliver random results, e.g. the keys 1,2,3,4,5,6 map to e,r,t,z,<enter> in a terminal on the remote-server. Here is our setup: Client is MAC OSX 10.11, running x2goclient 4.1.1.1 for MAC OS X 10.10 Server: Ubuntu 16.04.4 LTS (Xenial Xerus) output from x2goversion on the server is cups-x2go: 3.0.1.3 x2godesktopsharing: 3.1.1.4 x2goserver: 4.1.0.0 x2goserver-common: 4.1.0.0 x2goserver-extensions: 4.1.0.0 x2goserver-fmbindings: 4.1.0.0 x2goserver-printing: 4.1.0.0 x2goserver-x2goagent: 3.5.99.15 x2goserver-xsession: 4.1.0.0 Any ideas? Thanks, Thomas -- Dr. Thomas Stephan Arbeitsgruppe für funktionelle, strukturelle und molekulare Bildgebung Neurologisches Forschungshaus Klinikum Grosshadern Feodor-Lynen-Str. 19 81377 München Thomas.Stephan at lrz.uni-muenchen.de +49 89 4400-74819 (Fon) +49 89 4400-74801 (Fax)

1 1

Can we have some old rpms in the x2go.repo?
by Norman Gaywood 15 Mar '18

15 Mar '18

Last night after upgrading several Fedora 27 systems with the latest http://packages.x2go.org/fedora/$releasever/main/$basearch nxagent now segfaults sometimes on connection, sometimes when doing a move of the x2goclient screen. Problem is, I can't roll back to the previous version (to test) as the repo does not contain the older rpms? Would it be possible to have a version or two to be able to do a "dnf downgrade"? Cheers. -- Norman Gaywood, Computer Systems Officer School of Science and Technology University of New England Armidale NSW 2351, Australia ngaywood(a)une.edu.au http://turing.une.edu.au/~ngaywood Phone: +61 (0)2 6773 2412 Mobile: +61 (0)4 7862 0062 Please avoid sending me Word or Power Point attachments. See http://www.gnu.org/philosophy/no-word-attachments.html

2 9

Problems after upgrading to recent x2go-server and x2go client releases
by h i 15 Mar '18

15 Mar '18

Hello, I've been experiencing problems with opening applications and resizing my x2go client window after installing the newest version x2go-server. The issues occurs on Ubuntu 14.04 and 16.04. What happens now is that every time I maximize my x2go-client window, the images on screen rapidly flicker and won't stop until I minimize the screen. Also, each time I move the window, a quick flicker occurs across the screen. This never occurred before this new release. I have a few systems with the current x2go verison installed, here is the output: x2goversion x2goserver: 4.1.0.0 x2goserver-common: 4.1.0.0 x2goserver-extensions: 4.1.0.0 x2goserver-fmbindings: 4.1.0.0 x2goserver-printing: 4.1.0.0 x2goserver-x2goagent: 3.5.99.14 x2goserver-xsession: 4.1.0.0 We have another system running x2go server, but have yet to update it due to the problems we've experienced. Here is the output of the previous version we are running without the issues: x2goversion x2goagent: 3.5.0.33 x2goserver: 4.0.1.22 x2goserver-extensions: 4.0.1.22 x2goserver-xsession: 4.0.1.22 On the client side, I upgraded to the 4.1.1.1 from 4.1.0.0 and experienced some issues. I have to click on the outside/top-right edge of the session panel for the login session window to appear. Any thing closer to the middle, and it won't respond. I also get a pop-up message about the sound that I had not experienced with previous versions. Once logged into a session, the flickering resulting from moving/maximizing the window is much worse. Fortunately, I was able to revert back to x2go-client 4.1.0.0. However,is there a way to revert back to this previous version/configuration of x2goserver. Right now, it is has been a lot of flickering while to trying to do routine tasks with the current release. Any insight would be appreciated. Thanks. H.

3 7

Can't install X2goserver on Debian 9
by Nigra Truo 15 Mar '18

15 Mar '18

This is my main system, where I use X2goserver every day of the week and have done so for years, it worked really well for many years now. After doing the newest x2goserver update, several things broke and I can't install x2go anymore. So I decided to clean up any old install, purged everything. Purge complained that directories were not empty. Then, after I erased the directories, it complains that they are not there (apt is super annoying at times where you can't get it right, no matter how you try). Now I'm stuck, can't install or deinstall: When installing, I get: X2Go is configured to use a non-SQLite DB backend, leaving the database alone (who configure that? I definitely not. There should not be a piece of x2go configuration left on the system, the whole point of the purge) Then the installer fails, because it probably does not have any db to work with? --------------------------------------------------------------------------- Created symlink /etc/systemd/system/multi-user.target.wants/x2goserver.service → /lib/systemd/system/x2goserver.service. Job for x2goserver.service failed because the control process exited with error code. See "systemctl status x2goserver.service" and "journalctl -xe" for details. invoke-rc.d: initscript x2goserver, action "start" failed. ● x2goserver.service - X2Go Server Daemon Loaded: loaded (/lib/systemd/system/x2goserver.service; enabled; vendor preset: enabled) Active: failed (Result: exit-code) since Mon 2018-03-12 17:47:07 PDT; 7ms ago Process: 27309 ExecStart=/usr/sbin/x2gocleansessions (code=exited, status=255) --------------------------------------------------------------------------------- Now I still can't purge the config, when it complains that it has no directory to rm, I create the dir, yet it erases it, then complains that it is not there, which is the oddest thing ever: # apt purge x2goserver Reading package lists... Done Building dependency tree Reading state information... Done The following packages were automatically installed and are no longer required: libjlha-java libx2go-log-perl libx2go-server-db-perl libx2go-server-perl libxcompshad3 linux-headers-4.9.0-4-amd64 linux-headers-4.9.0-4-common linux-headers-4.9.0-5-amd64 linux-headers-4.9.0-5-common nxagent x2goserver-common x2goserver-x2goagent Use 'apt autoremove' to remove them. The following packages will be REMOVED: x2goserver* x2goserver-extensions* x2goserver-fmbindings* x2goserver-printing* x2goserver-xsession* 0 upgraded, 0 newly installed, 5 to remove and 2 not upgraded. 5 not fully installed or removed. After this operation, 730 kB disk space will be freed. Do you want to continue? [Y/n] (Reading database ... 660010 files and directories currently installed.) Removing x2goserver-xsession (4.1.0.0-0x2go1.2+git20180302.1517+9.main.1) ... Removing x2goserver-printing (4.1.0.0-0x2go1.2+git20180302.1517+9.main.1) ... Removing x2goserver-extensions (4.1.0.0-0x2go1.2+git20180302.1517+9.main.1) ... Removing x2goserver-fmbindings (4.1.0.0-0x2go1.2+git20180302.1517+9.main.1) ... Error in file "/usr/share/applications/evince.desktop": "" is an invalid MIME type ("" does not contain a subtype) Removing x2goserver (4.1.0.0-0x2go1.2+git20180302.1517+9.main.1) ... Processing triggers for mime-support (3.60) ... Processing triggers for desktop-file-utils (0.23-1) ... Processing triggers for doc-base (0.10.7) ... Processing 4 removed doc-base files, 2 added doc-base files... Error while merging /usr/share/doc-base/kino-en with /usr/share/doc-base/kino-fr: format html already defined. Registering documents with scrollkeeper... Processing triggers for man-db (2.7.6.1-2) ... Processing triggers for shared-mime-info (1.8-1) ... Unknown media type in type 'all/all' Unknown media type in type 'all/allfiles' Processing triggers for gnome-menus (3.13.3-9) ... (Reading database ... 659820 files and directories currently installed.) Purging configuration files for x2goserver-printing (4.1.0.0-0x2go1.2+git20180302.1517+9.main.1) ... Purging configuration files for x2goserver-xsession (4.1.0.0-0x2go1.2+git20180302.1517+9.main.1) ... Purging configuration files for x2goserver-fmbindings (4.1.0.0-0x2go1.2+git20180302.1517+9.main.1) ... Error in file "/usr/share/applications/evince.desktop": "" is an invalid MIME type ("" does not contain a subtype) Purging configuration files for x2goserver (4.1.0.0-0x2go1.2+git20180302.1517+9.main.1) ... rmdir: failed to remove '/etc/x2go': No such file or directory dpkg: error processing package x2goserver (--purge): subprocess installed post-removal script returned error exit status 1 Errors were encountered while processing: x2goserver needrestart is being skipped since dpkg has failed E: Sub-process /usr/bin/dpkg returned an error code (1) ------------------------------------------------------------------------------------------------ so I create /etc/x2go mkdir /etc/x2go execute purge again and get the same error: Purging configuration files for x2goserver (4.1.0.0-0x2go1.2+git20180302.1517+9.main.1) ... rmdir: failed to remove '/etc/x2go': No such file or directory # ls /etc/x2go ls: cannot access '/etc/x2go': No such file or directory ------------------------------------------------------------- But anyway, even when all config is removed from the system, I still can't install it, I still get the configuration message for the db. -- *Por sperto kaj lerno ne sufiĉas eterno.*

3 8

Mint 18.3
by Robert Dinse 11 Mar '18

11 Mar '18

I get a similar response trying to install the Nightly Builds apt install x2goserver Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: x2goserver : Depends: x2goserver-x2goagent (< 4.1.0.1-0~1609~ubuntu16.04.1.1~) but it is not going to be installed Depends: x2goserver-x2goagent (>= 4.1.0.1-0~1609~ubuntu16.04.1) but it is not going to be installed E: Unable to correct problems, you have held broken packages. dpkg --configure -a does not show any partly installed packages. -_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_- Eskimo North Linux Friendly Internet Access, Shell Accounts, and Hosting. Knowledgeable human assistance, not telephone trees or script readers. See our web site: http://www.eskimo.com/ (206) 812-0051 or (800) 246-6874.

1 0

Mint 18.3
by Robert Dinse 11 Mar '18

11 Mar '18

Trying to install x2go stable on Mint 18.3 and getting this: apt install x2goserver x2goclient x2gomatebindings x2golxdebindings --install-suggests --install-recommends --fix-broken --fix-missing Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: x2goserver : Depends: x2goserver-x2goagent (>= 4.1.0.0-0~1517~ubuntu16.04.1) but it is not going to be installed Depends: x2goserver-x2goagent (< 4.1.0.0-0~1517~ubuntu16.04.1.1~) but it is not going to be installed E: Unable to correct problems, you have held broken packages. I do not undersatnd how it can depend upon a version both less than and greater than the current version available. mint sources.list.d # apt list x2goserver-x2goagent Listing... Done x2goserver-x2goagent/xenial,xenial 4.1.0.0-0~1517~ubuntu16.04.1 all mint sources.list.d # apt list nxagent Listing... Done nxagent/xenial 2:3.5.99.15-0~201803072246~ubuntu16.04.1 amd64 -_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_- Eskimo North Linux Friendly Internet Access, Shell Accounts, and Hosting. Knowledgeable human assistance, not telephone trees or script readers. See our web site: http://www.eskimo.com/ (206) 812-0051 or (800) 246-6874.

1 0

x2go Windows Client: Strange Issue with Screen Update
by Michael Klemm 10 Mar '18

10 Mar '18

Dear x2go-user list, I'm having trouble with the x2go Windows client on one of my machines. It seems that it misses some screen updates (see the attached screen shot). The screen was made after a I typed "ls" a few times. After I reconnect the session, the screen is updated properly once and then subsequent updates are missing again. This is on Windows 10 Pro (version 1709) and x2go client 4.1.1.1 (nightly build 2017-11-14). The error also happens with the 4.1.0 client. The server is a CentOS 7.4 box with x2goserver-4.0.1.20-1.el7.x86_64, the desktop is KDE. The same client version works perfectly on another Windows machine, so I doubt that the server or KDE is the culprit. If someone could provide me with a hint how to debug this issue to create a bug report, I'd appreciate it. Thanks! Kind regards, -michael

1 1

x2go problems
by Steven Spencer 08 Mar '18

08 Mar '18

Greetings, We use x2go extensively for some access to some Ubuntu based LTSP servers. Suddenly over the last two days, we get the following in the client: "The remote proxy closed the connection while negotiating the session. This may be due to the wrong authentication credentials passed to the server." And on the server we are trying to connect to, we see this in the logs: /usr/bin/x2goresume-session: client [ip.address.of.client] has successfully resumed session with ID kscadmin-51-1520534328_stDMATE_dp24 /usr/bin/x2gosetkeyboard: /home/ksca0dmin/.x2go/C-kscadmin-51-1520534328_stDMATE_dp24/keyboard did not appear within 30s after agent startup We are never able to connect. This happens even on all servers that we connect to and includes older server versions: x2goagent: 3.5.0.33 x2goserver: 4.0.1.22 x2goserver-extensions: 4.0.1.22 x2goserver-xsession: 4.0.1.22 As well as newer ones: x2goserver: 4.1.0.0 x2goserver-common: 4.1.0.0 x2goserver-extensions: 4.1.0.0 x2goserver-fmbindings: 4.1.0.0 x2goserver-printing: 4.1.0.0 x2goserver-x2goagent: 3.5.99.14 x2goserver-xsession: 4.1.0.0 Unfortunately, the clients are now updated as well trying to fix this issue, but they were failing on the older client version as well: X2Go Client v. 4.1.1.1 (Qt - 4.8.7) Any help would be appreciated. Thanks, -- -- Steven G. Spencer, Network Administrator KSC Corporate - The Kelly Supply Family of Companies Office 308-382-8764 Ext. 1131 Mobile 402-765-8010

1 0

x2go server closes the inactive connection and not possible to connect again
by Pongrácz István 07 Mar '18

07 Mar '18

Hi, I use x2go successfully for several years and I very like it, thank you! I have a problem with the latest x2go (http://ppa.launchpad.net/x2go/st able/ubuntu xenial main). I can login without problem to the server, working as expected, but when I do not work on the x2go session (inactive or idle), the server closes the connection and it is not possible to connect again. Before the upgrade I had open sessions for days. Any idea? Below the technical details. The client debug shows (short version): x2go-DEBUG-../src/sshmasterconnection.cpp:2089> Forwarding parameters: from remote ("localhost":49454) to local ("localhost":49788) x2go-DEBUG-../src/sshmasterconnection.cpp:2126> Temporary session port after config file parse: 49454 x2go-DEBUG-../src/sshmasterconnection.cpp:2130> Temporary session host after config file parse: localhost x2go-DEBUG-../src/sshmasterconnection.cpp:2160> New channel forwarded. x2go-DEBUG-../src/sshmasterconnection.cpp:2320> "ssh_channel_write failed": "Remote channel is closed" x2go-DEBUG-../src/sshprocess.cpp:472> I/O error: "ssh_channel_write failed."" - Remote channel is closed" (2). x2go-DEBUG-../src/sshmasterconnection.cpp:2363> EOF sent. x2go-DEBUG-../src/sshmasterconnection.cpp:2367> Channel closed. x2go-DEBUG-../src/onmainwindow.cpp:6459> Proxy wrote on stderr: "Loop: PANIC! The remote NX proxy closed the connection. Error: The remote NX proxy closed the connection. " x2go-DEBUG-../src/onmainwindow.cpp:6459> Proxy wrote on stderr: "Loop: PANIC! Failure negotiating the session in stage '7'. Error: Failure negotiating the session in stage '7'. Loop: PANIC! Wrong version or invalid session authentication cookie. Error: Wrong version or invalid session authentication cookie. So, on the server side the port 49454 did not exist and even on the server I can see the session running (with ps ax), it is not possible to connect (The remote NX proxy closed the connection....)) I did not find fresh or relevant information on the net, I spent about 2 days to figure out, but without success (purge, reinstall, xsession removing etc. - all done, without results) On the server, the sshd log contains this relevant information (it is the pair of the client debug log above): Mar 5 19:45:11 localhost sshd[19999]: Accepted publickey for xxxx from YYYYY.98 port 43002 ssh2: RSA SHA256:notrelevant Mar 5 19:45:11 localhost sshd[19999]: pam_unix(sshd:session): session opened for user username by (uid=0) Mar 5 19:45:11 localhost systemd-logind[787]: New session 9 of user username. Mar 5 19:45:22 localhost su[20438]: Successful su for username by root Mar 5 19:45:22 localhost su[20438]: + ??? root:username Mar 5 19:45:22 localhost su[20438]: pam_unix(su:session): session opened for user username by (uid=0) Mar 5 19:45:22 localhost systemd-logind[787]: New session c1 of user username. Mar 5 19:45:22 localhost su[20438]: pam_unix(su:session): session closed for user username Mar 5 19:45:22 localhost su[20492]: Successful su for username by root Mar 5 19:45:22 localhost systemd-logind[787]: Removed session c1. Mar 5 19:45:22 localhost su[20492]: + ??? root:username Mar 5 19:45:22 localhost su[20492]: pam_unix(su:session): session opened for user username by (uid=0) Mar 5 19:45:22 localhost systemd-logind[787]: New session c2 of user username. Mar 5 19:45:24 localhost su[20492]: pam_unix(su:session): session closed for user username Mar 5 19:45:24 localhost systemd-logind[787]: Removed session c2. Mar 5 19:45:25 localhost sshd[3615]: pam_unix(sshd:session): session closed for user username Mar 5 19:45:29 localhost sshd[20011]: error: connect_to localhost port 49454: failed. Mar 5 19:45:29 localhost sshd[20011]: channel_by_id: 0: bad id: channel free Mar 5 19:45:29 localhost sshd[20011]: Disconnecting: Received ieof for nonexistent channel 0. Mar 5 19:45:29 localhost sshd[19999]: pam_unix(sshd:session): session closed for user username Mar 5 19:45:29 localhost systemd-logind[787]: Removed session 9. The x2go server log from the syslog: Here is the session opened first time, successfully, you can see the agent port (49454): Mar 5 18:31:11 localhost /usr/bin/x2gostartagent: creating new session: username-50-1520271069_stDMATE_dp24 2a3a4f78ebac6c1318558ebfebbffff1 3799 YYYY.98 49454 49455 49456 -1 -1 In the syslog I did not find any related information about nxagent closing, but only the unsuccessful reconnect after 1 hour and 14 minutes. First reconnect, I was able to see the session selector window and I saw the session as running state, but I had only Suspend and Terminate buttons active. I pushed the suspend and resume, problem occurred. Here are the packages on the server: ii cups-x2go 3.0.1.3- 1 all Virtual X2Go printer for CUPS ii libx2go-log-perl 4.1.0.0- 0~1517~ubuntu16.04.1 all Perl X2Go::Log package ii libx2go-server-db-perl 4.1.0.0- 0~1517~ubuntu16.04.1 i386 Perl X2Go::Server:DB package ii libx2go-server-perl 4.1.0.0- 0~1517~ubuntu16.04.1 all Perl X2Go::Server package rc x2goagent 2:3.5.0.33- 0~710~ubuntu16.04.1 all X2Go agent rc x2godesktopsharing 3.1.1.4- 0~186~ubuntu16.04.1 i386 Share X11 desktops with other users via X2Go ii x2gomatebindings 0.0.1.5- 0~203~ubuntu16.04.1 i386 X2Go MATE bindings and MIME types ii x2goserver 4.1.0.0- 0~1517~ubuntu16.04.1 i386 X2Go server daemon scripts ii x2goserver-common 4.1.0.0- 0~1517~ubuntu16.04.1 i386 X2Go Server (common files) ii x2goserver-extensions 4.1.0.0- 0~1517~ubuntu16.04.1 all X2Go Server (extension support) ii x2goserver-printing 4.1.0.0- 0~1517~ubuntu16.04.1 all X2Go server (printing support) ii x2goserver-x2goagent 4.1.0.0- 0~1517~ubuntu16.04.1 all X2Go Server's X2Go Agent rc x2goserver-xsession 4.1.0.0- 0~1517~ubuntu16.04.1 all X2Go Server (Xsession runner) Here are the packages on the client: ii cups- x2go 3.0.1.3- 1 all Virtual X2Go printer for CUPS rc x2goagent 2:3.5.0 .33-0~710~ubuntu16.04.1 all X2Go agent ii x2goclient 4.1.1.1 -0~1719~ubuntu16.04.1 amd64 X2Go Client application (Qt4) rc x2gomatebindings 0.0.1.5 -0~203~ubuntu16.04.1 amd64 X2Go MATE bindings and MIME types rc x2goserver 4.0.1.2 2-0~1197~ubuntu16.04.1 amd64 X2Go server daemon scripts rc x2goserver- printing 4.0.1.22- 0~1197~ubuntu16.04.1 all X2Go server daemon scripts (printing) rc x2goserver- xsession 4.0.1.22- 0~1197~ubuntu16.04.1 all X2Go server daemon scripts (Xsession runner) ii x2gousbmount 1.1.0.2 -0~469~ubuntu16.04.1 all clientside usb mass-storage device mounting

3 5

SSH error with pyhoca-gui
by Michael Eager 06 Mar '18

06 Mar '18

I'm seeing a message saying "SSH Error" with pyhoca-gui when connecting to a CentOS 7 server. The message in /var/log/secure on the server is Connection closed by 192.168.20.12 port 36098 [preauth] I can log in to the server using SSH, and I am able to connect using pyhoca-cli and x2goclient. The profile specifies a shared id_rsa key. On the server: x2goserver-4.0.1.20-1.el7.x86_64 On the client: x2goclient-4.1.1.0-1.fc27.x86_64 python2-x2go-0.5.0.5-2.fc27.noarch pyhoca-gui-0.5.0.6-4.fc27.noarch pyhoca-cli-0.5.0.3-5.fc27.noarch How can I tell what pyhoca-gui is doing differently/incorrectly? -- Michael Eager eager(a)eagerm.com

1 0

X2Go Client: Startup of VcXsrv sometimes fails
by Schmid Andreas 06 Mar '18

06 Mar '18

Hi, I'm running X2Go Client 4.1.0.0 on Windows Server 2012 R2 for connecting to X2Go Server 4.0.1.22 on Ubuntu 14.04. This usually works flawlessly. Since about 4 months ago, however, X2Go Client *sometimes* fails to fully establish the session. (Sometimes means that it happens quite unregularly; which makes it hard to reproduce. But when it happens, it can last from 5 minutes up to around 30 minutes until connections are successful again.) In these cases X2Go Client actually connects to the server, but the startup of VcXsrv fails, so X2Go Client subsequently terminates the connection. I attached the log output of VcXsrv below. I suspect that in the cases when the connection fails to fully establish, VcXsrv for some reason doesn't manage to find a free display number. Maybe this is due to the fact that on the Windows server several users are logged in simultaneously and use X2Go Client. Another guess is that VcXsrv might not like the fact that the Windows server has two IPv4 addresses. Does anyone have a clue what could be the reason for it? Or where I could find further information on these error messages? Thank you for any hint. On the client side, the following is logged in C:\Users\<username>\AppData\Local\Temp\VCXSrv.0.log when the connection fails: -- Welcome to the VcXsrv X Server Vendor: The X2Go and Arctica Projects Release: 1.17.0.0 OS: Windows NT 6.2 build 9200 (WoW64) Contact: https://github.com/ArcticaProject/vcxsrv _XSERVTransSocketCreateListener: failed to bind listener _XSERVTransSocketINETCreateListener: ...SocketCreateListener() failed _XSERVTransMakeAllCOTSServerListeners: failed to create listener for inet DefineSelf - d16s003 has IPv6 addresses... ::1 LoadPreferences: C:\Users\<username>\AppData\Roaming/.XWinrc not found LoadPreferences: Loading P:\X2Go\V4_1_0_0\x2goclient\vcxsrv\system.XWinrc Warning: Locale not supported by X, falling back to 'C' locale. wglwrap: Can't resolve "wglGetExtensionsStringARB" (EE) AIGLX: Won't use generic native renderer as it is not accelerated (II) AIGLX: Loaded and initialized swrast (II) GLX: Initialized DRISWRAST GL provider for screen 0 winBlockHandler - pthread_mutex_unlock() winInitMultiWindowWM - Could not open display, try: 1, sleeping: 5 winInitMultiWindowWM - Could not open display, try: 2, sleeping: 5 winInitMultiWindowWM - Could not open display, try: 3, sleeping: 5 winInitMultiWindowWM - Could not open display, try: 4, sleeping: 5 winInitMultiWindowWM - Could not open display, try: 5, sleeping: 5 winInitMultiWindowWM - Failed opening the display. Exiting. (EE) Server terminated with error (1). Closing log file. -- In the case of successful connection, the log output looks like: -- Welcome to the VcXsrv X Server Vendor: The X2Go and Arctica Projects Release: 1.17.0.0 OS: Windows NT 6.2 build 9200 (WoW64) Contact: https://github.com/ArcticaProject/vcxsrv DefineSelf - d16s003 has 2 usable IPv4 interfaces... addresses 10.36.2.103 10.36.18.106 DefineSelf - d16s003 has IPv6 addresses... ::1 LoadPreferences: C:\Users\<uername>\AppData\Roaming/.XWinrc not found LoadPreferences: Loading P:\X2Go\V4_1_0_0\x2goclient\vcxsrv\system.XWinrc Warning: Locale not supported by X, falling back to 'C' locale. wglwrap: Can't resolve "wglGetExtensionsStringARB" (EE) AIGLX: Won't use generic native renderer as it is not accelerated (II) AIGLX: Loaded and initialized swrast (II) GLX: Initialized DRISWRAST GL provider for screen 0 winBlockHandler - pthread_mutex_unlock() winClipboardThreadProc - DISPLAY=127.0.0.1:0.0 -- When I just start vcxsrv.exe, I'm getting the same messages. At times when connections fail: -- Welcome to the VcXsrv X Server Vendor: The X2Go and Arctica Projects Release: 1.17.0.0 OS: Windows NT 6.2 build 9200 (WoW64) Contact: https://github.com/ArcticaProject/vcxsrv _XSERVTransSocketCreateListener: failed to bind listener _XSERVTransSocketINETCreateListener: ...SocketCreateListener() failed _XSERVTransMakeAllCOTSServerListeners: failed to create listener for inet DefineSelf - d16s003 has IPv6 addresses... ::1 LoadPreferences: C:\Users\<username>\AppData\Roaming/.XWinrc not found LoadPreferences: Loading P:\X2Go\V4_1_0_0\x2goclient\VcXsrv\system.XWinrc Warning: Locale not supported by X, falling back to 'C' locale. (EE) AIGLX: No native OpenGL in modes with a root window (II) AIGLX: Loaded and initialized swrast (II) GLX: Initialized DRISWRAST GL provider for screen 0 winBlockHandler - pthread_mutex_unlock() -- At times when connections work: -- Welcome to the VcXsrv X Server Vendor: The X2Go and Arctica Projects Release: 1.17.0.0 OS: Windows NT 6.2 build 9200 (WoW64) Contact: https://github.com/ArcticaProject/vcxsrv DefineSelf - d16s003 has 2 usable IPv4 interfaces... addresses 10.36.2.103 10.36.18.106 DefineSelf - d16s003 has IPv6 addresses... ::1 LoadPreferences: C:\Users\<username>\AppData\Roaming/.XWinrc not found LoadPreferences: Loading P:\X2Go\V4_1_0_0\x2goclient\VcXsrv\system.XWinrc Warning: Locale not supported by X, falling back to 'C' locale. (EE) AIGLX: No native OpenGL in modes with a root window (II) AIGLX: Loaded and initialized swrast (II) GLX: Initialized DRISWRAST GL provider for screen 0 winBlockHandler - pthread_mutex_unlock() -- Best, Andy

1 0

Ldap auth fails
by martti pitkanen 05 Mar '18

05 Mar '18

Hi, After most recent update, PAM Ldap authentication fails, client claims "Wrong credentials" However, auth_log shows that X2Go login was successful (lower), as well as cmd line remote login (upper) instance. Mar 5 13:51:17 localhost su[30229]: Successful su for ratoansa by root Mar 5 13:51:17 localhost su[30229]: + ??? root:ratoansa Mar 5 13:51:17 localhost su[30229]: pam_unix(su:session): session opened for user ratoansa by (uid=0) Mar 5 13:51:17 localhost systemd-logind[826]: New session c49 of user ratoansa. Mar 5 13:51:17 localhost su[30229]: pam_unix(su:session): session closed for user ratoansa Mar 5 13:51:17 localhost systemd-logind[826]: Removed session c49. Mar 5 13:51:17 localhost su[30248]: Successful su for ratoansa by root Mar 5 13:51:17 localhost su[30248]: + ??? root:ratoansa Mar 5 13:51:17 localhost su[30248]: pam_unix(su:session): session opened for user ratoansa by (uid=0) Mar 5 13:51:17 localhost systemd-logind[826]: New session c50 of user ratoansa. Mar 5 13:51:18 localhost su[30248]: pam_unix(su:session): session closed for user ratoansa Mar 5 13:51:18 localhost systemd-logind[826]: Removed session c50. Ma -- --- Martti Pitkänen APLcomp Oy Mariankatu 17 00170 Helsinki Finland Tel +358 9 1357266 Mob +358 40 0602157 www.aplcomp.com Mail: P.O.BOX 126 00171 Helsinki Finland

1 0

LinuxMint 18.3 upgrade fails
by martti pitkanen 03 Mar '18

03 Mar '18

Hi, -After the most resent update: x2goagent : Depends: nxagent (< 2:3.5.0.33-0~710~ubuntu16.04.1.1) -however, nxagent is already the newest version (2:3.5.99.14-0~816~ubuntu16.04.1). -- --- Martti Pitkänen APLcomp Oy Mariankatu 17 00170 Helsinki Finland Tel +358 9 1357266 Mob +358 40 0602157 www.aplcomp.com Mail: P.O.BOX 126 00171 Helsinki Finland

7 44

More Details on Wedgeing
by Robert Dinse 03 Mar '18

03 Mar '18

I have discovered that, when the session disconnects abruptly and I go to reconnect, if I choose to terminate the session instead of trying to reconnect to it, then x2goserver does not wedge. -_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_- Eskimo North Linux Friendly Internet Access, Shell Accounts, and Hosting. Knowledgeable human assistance, not telephone trees or script readers. See our web site: http://www.eskimo.com/ (206) 812-0051 or (800) 246-6874.

1 0

SSH
by Robert Dinse 02 Mar '18

02 Mar '18

Looks like my ssh is hurt: [256092.528160] SshMasterConnec[4630]: segfault at dd ip 00007fc61a459eec sp 00007fc5ee2b8928 error 4 in libssh.so.4.4.2[7fc61a433000+6d000] [256163.639990] SshMasterConnec[5083]: segfault at dd ip 00007fa0a3453eec sp 00007fa0772ee928 error 4 in libssh.so.4.4.2[7fa0a342d000+6d000] This might be my issue rather than x2go, but it never happens when I do a straight ssh session. -_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_- Eskimo North Linux Friendly Internet Access, Shell Accounts, and Hosting. Knowledgeable human assistance, not telephone trees or script readers. See our web site: http://www.eskimo.com/ (206) 812-0051 or (800) 246-6874.

1 1

Mint now Ubuntu
by Robert Dinse 02 Mar '18

02 Mar '18

I updated a Ubuntu system with nightly builds and now it is doing the same as Mint but only if I login as root. If I login with a normal UID it does not. -_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_- Eskimo North Linux Friendly Internet Access, Shell Accounts, and Hosting. Knowledgeable human assistance, not telephone trees or script readers. See our web site: http://www.eskimo.com/ (206) 812-0051 or (800) 246-6874.

1 0

Mint
by Robert Dinse 02 Mar '18

02 Mar '18

The output of: dpkg -l | grep -iE '(x2go|nx)'? ... Was too large to post to the list so I've thrown it up on my ftp server, you can retrieve it from ftp.eskimo.com, username: anonymous, password: (your e-mail address). It is x2go-mint.txt. -_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_- Eskimo North Linux Friendly Internet Access, Shell Accounts, and Hosting. Knowledgeable human assistance, not telephone trees or script readers. See our web site: http://www.eskimo.com/ (206) 812-0051 or (800) 246-6874.

2 2

Mint
by Robert Dinse 02 Mar '18

02 Mar '18

The nightly builds won't install and the stable doesn't work. When I try to login I get a pop-up: The remote proxy closed the connection while negotiating the session. This may be due to the wrong authentication credentials passed to the server. -_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_- Eskimo North Linux Friendly Internet Access, Shell Accounts, and Hosting. Knowledgeable human assistance, not telephone trees or script readers. See our web site: http://www.eskimo.com/ (206) 812-0051 or (800) 246-6874.

2 4

Fedora
by Robert Dinse 01 Mar '18

01 Mar '18

After todays Fedora updates, the Nightly Builds of x2goserver no longer works. It starts up and then immediately exits, the mate-session crashes. Yet Mate does not crash under the stable build but also does not set the screen size properly owing to the xrandr version issue. -_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_- Eskimo North Linux Friendly Internet Access, Shell Accounts, and Hosting. Knowledgeable human assistance, not telephone trees or script readers. See our web site: http://www.eskimo.com/ (206) 812-0051 or (800) 246-6874.

1 0

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